Magneto



Aug'. 23,19%/ 1,640,290

` J. E. PRISSET, SURNAMED E. PRISSET MAGNETO A Filed July 11, 192.5 2 Shoots-Sheet 1 Aug. 23,1927. l 1,640,290

J. E. PRISSET,-SURNAMED E. PRISSET MAGNETO Filed July 11. 1925 2 Shoots-Shoot 2 /N vE/vm/e .JEAN E. Pere/5.557

ATTORNEYS Patented Aug. 23, 1927.

UNITED STATES PATENT'OFFICE.

i ,JEAN EMILE iPRIvs'sn'r,y sUnNAMnD` EMMANUEL Pn'nrssn'r, or CHATILLONLSOUSQ DAGNEUX, FRANCE.

MAGNETQ.

' `App1icativonr`i1ed July 11, 1 925, Serial No. 43,023, and in France May 19, 1925.

The present Vinvention is adapted to lrem- 'Ledy'a' numberl of inconveniences -in Vexisting high tension magnetos and particularly j the diliculti'es Vpresented by the adjustment of theb'reaking device The magneto iny accordancewith the in,-

\ breaking devicejfcomprising two 'platinized nonadjustable contactsfand a cam capable "contacts and adjustable from the exterior during the operation by means of` a member which can be operated andeasily locked.

4 7 This magneto presentsvarious other charv l5 acterlstic arrangements Awhich will be described yin detail and claimed hereinafter.y

In the accompanying drawing, Fig. l is a longitudinal section.

f" 'Fig 2 is a half plan view and haltA sectional plan view. f

Fig. 3 is a half section anda half rear view.

Fig. 4 is a half section` and a half front l VleW.

Fig. 5 represents the interior of vthe front plate of the ma eto. f

Fig. 6 shows the inner face of the rear plate. f

Fig. 7 is a face view of the springli in Fig.v l and-Fig. 83a sectional view -on line 8-8 ofFigp? of the adjusting and stop The magneto comprises a frame a form- `ing'fa housing or case and closed at its front j'part by a removable cheek a1r secured by means of screws a2.

b is -horizontallyarranged and fitted in such a manner that its two branches embrace the frame by sliding along its side faces.` This magnet is held by means of a single needle screw c screwed in the frame and ttingin a small notch provided' in the headv of the magnet. Two terminals d (only one being shown) made of insulating material Vserve as means for lthe attachment of the high tension current wires and carry conaor " large cavity e provided between the frame and the head of t-hemagnet. These con? tact pieces are each constituted by a `ver-'v tical `rod Aterminating in al point cl2 lwhich forms with thek edge of 'anjorfice e1`pro" vided in the `rameopposite' the point Z2 a safety gap. At the point where these spark striking point. j'v'entlon is essentially characterized by its jury to theV elementsv tov and from A horseshoe magnet" one of the thimbles 13 which serveto secure v j Y i this ring. tact pieces d1 which are arranged within a 1 presenting aconcave surface which gives them a spark strikingsurface insteado'f a v 60 The advantages Vof the above arrangement causesa distribution ofthe spark gap over y j a larger surface linstead ofl concentrating y10 of determining the separa-tion of these -two the Spark ata single'point incas'eiof variable advancement and thus preventing" inwhich the spark makes itsjump. i

The top of `the terminals Z is provided with a knob havinga pointed screw 7 'which can secure the conducting cable' by penetration ormany other mannen* These V.terminals are 'moreover provided with a securing lmeansl through thev mediumV ofl a spring 8 in the shape of a hair-pin, which-fits inea groove provided orfthat purpose andloff a y'f5 rubber or `like washer 9 forming a tight joint.

The cavity e perfectly aerated by thel orikfces el serves therefore asstriking chamber for the breaking sparks Vand eventually as a chamber in which the 'sparks are produced either `during normal iper'ation'oiiv the device or Vwhen va spark `is had between the point d2 and the cavity el.` l A Therotor has a drum which supports the core f1 onwhich are arranged the `primary and secondary windings. l j Y A cylindrical condenserv g is held by two small plates l() rigid with the front vpartv of the rrear casing and which pre'ss on` one of the poles ofthe condenser g withfinterpositionof an insulatingmaterial. j

The insulated pole 14 ofl thecondenser g v is connected withvl the primary winding' through the mediumof a wire 20, `which passesthrough the larmature/ina groovefQl -Aand, on the other hand, by a ring ll ararangedbetween the ball-bearing l2 and the .flared portion of the distributor.

A corresponding groove is provided on the rear face of the plate of the rotor and on the distributor for receiving'the ring 1l. The breaking `device of the primary winding, is

arranged at the front part of the magneto.

20. at its center forallowing the passage of thisV It 'com rises a spring z' secured on the rotor at right angles to the axis and recessed axis. This spring which is electrically connected to the body, carries an abutment or sheer?, made of insulating material, and a platinized contact secured on the same in an invariable position.

The two contacts arearranged opposite i each other and the spring 71 constantly tends to press the contact 2 upon the contact Zal, sho as to ensure the connection between the primary winding and the body through the =.medium of the ring K.

This ring forms moreover a commutator for the primary winding; in fact, a brush L (Fig. l) is constantly pressed uponthe outer surface of the ring. This brush is arranged on a contact piece L1 which can be placed in `body connection through the medium of a wire, so as topermit to interrupt at will the ignition. v Y

This contact piece is secured on the inspec- -tion cover m of the primary winding; this cover is constituted by anv insulating block which can be freely removed and can be imn mobilized by two push-pieces 5. The said cover closes an opening m1 provided at the i upper part of the frame.

The breaking of the primary winding is Aobtained by the separation of the contacts 'i2 and K1 by means of a cam a on which bears, upon rotation of the rotor the abutvment z' of` the spring i. The spring then kyields and separates the contact i2 from eontact K1. The cam is carried by a circular The cam and the bracing member are ring-shaped so as `to allowk the passage of the axis of the rotor. The bracing member is pushed back against the inner face of the cheek al by a spring 'n2 in the shape of a cup and taking a bearing against a ledge.

Theadjustinent of the distance separating the platinized contacts upon breaking, is effected byl axial displacement of the cam n.

For that purpose, a number of orifices paral` lel to the axis of the rotor are formed in the cheek al. These oriiices allow the )assagc of push pieces Pl carried by a ring l (Fig. l) integral with the said push pieces; this ring is arranged within the adjusting crown l whiclris recessed for receiving the ring l. By screwing this crown, the ring 1 and the push pieces are pushed.

lIn the adjusting crown P- are formed notches 3 (F ig.V 2) in which can lit the tongue shaped end 4fL of an adjusting and stop spring 4 (Fig. 1).; this arrangement allows to easily effect the adjustment. The said spring. 4 is in theshape of a crescent (Fig. 7)

and can be secured on the front cheek of the machine; when the tongue 4L is fitted in one of the notches oi' the crown l), it prevents any unloosening of the latter; `for causing the crown P to rotate, the spring is released. This locking system has the advantageof Y )reventinfr an. untimel unloosenin jr and determining misadjustment. The adjusting crown P is screwedon a central projection oit the cheek al; by screwing itv on more or less, the brace and the cam are axially moved,

thesprings n2 holding this brace and 4cam pressed against the push pieces. From the position of the cam thus obtained depends the spacing apart of the two platinized contacts.

Claims Y l. In a high tension magneto, comprising an outer adjusting system^ provided with a cam, a particular arrangement of this adjusting system consisting oi' a hollow crown, a ring within this crown, push pieces on this .,iing, these push pieces being permanently secured in position and acting on the adjusting cam.

2. In a high tension magneto, a breaking device comprising an adjusting means for the breaking device, a locking device for the breaking device including an radjusting crown having notches, anda crescent shaped spring carrying a tongueV which fits by itself in the said notches, both the adjusting ymeans and locking device being actuated Amember being connected to the primary member and toa contact piece which can be earthed for interrupting the ignition at will.

4. In a high tension magneto, a housing a drum in the housing, a condenser 4in the drum, and two small plates rigid with the drum and bearing on the condenser with'V interposition of'an insulating material.

5. In a high tension magneto, a condenser,

' a primary ring, -thimbles for securing the ring, Yan armature having a longitudinal groove and an insulated cable secured to the condenser and to one of the securing thim- JEAN EMILE PRISSET',

Surnamed Emmanuel Pm'sset. 

